v0.7.0

Changelog

• 41725a5 prodvider/slack: only update a check-in's messages every 5m, serialize req handling
• 436e1d3 provider/slack: only adjust future messages if the snooze is longer
• 25b55cb provider/slack: delete all scheduled messages that match
• b489996 provider/slack: continue after delete fails with invalid_scheduled_message_id
• d3ec6ff provider/slack: log when scheduled messages are deleted